What DeepSeek publishes
The official release describes text-and-image input, configurable reasoning effort, a one-million-token context, and a Causal Encoder-Decoder architecture designed to reduce key-value cache pressure.
Released September 10, 2026
DeepSeek V4.1 Flash
The current Flash release brings a new official model name, a revised architecture, native multimodal capability, and a one-million-token context. This page separates verified model facts from what this independent API gateway actually supports.
DeepSeek-V4.io is an independent service, not the official DeepSeek website.
552B
total MoE parameters
8B / 16B
activated for input / output
1M
published context window
Text + image
underlying model input
Use the model ID for your provider
The release name is not a universal API identifier. Copying the wrong provider slug is the most likely migration failure.
ProviderModel valueWhat it means
Official DeepSeek API
deepseek-flashUse the current DeepSeek API documentation.OpenRouter
deepseek/deepseek-v4.1-flashUse this exact upstream route for V4.1.DeepSeek-V4.io
deepseek-v4-flashStable public alias; text requests route to V4.1 server-side.Model capability and gateway support are different
What this gateway supports today
DeepSeek-V4.io currently exposes text requests through Chat Completions, Responses, and Anthropic Messages-compatible endpoints. Image input is intentionally not advertised until upload, accounting, error, and billing behavior pass verification.
Frequently asked questions
Is DeepSeek V4.1 Flash the latest Flash release?
Yes. DeepSeek announced V4.1 Flash on September 10, 2026. The official change log says the previous V4 Flash and V4 Flash Vision Exp models were retired, with old names temporarily routed to V4.1 Flash.
Which model ID should I use?
Use deepseek-flash with the official DeepSeek API, deepseek/deepseek-v4.1-flash with OpenRouter, and deepseek-v4-flash with the DeepSeek-V4.io gateway. The provider determines the identifier.
Do existing DeepSeek-V4.io clients need a model rename?
No. The public alias remains deepseek-v4-flash so existing integrations continue working while the upstream route changes server-side.
Can I send images through this gateway?
Not yet. V4.1 Flash is a multimodal model, but DeepSeek-V4.io currently verifies and documents text input only. Image input needs a separate end-to-end release gate for uploads, accounting, errors, and billing.
Should I use V4.1 Flash or V4 Pro?
Start with V4.1 Flash for throughput, latency, and cost-sensitive workloads. Evaluate V4 Pro separately when difficult knowledge, long-context retrieval, or complex coding tasks justify a larger model.
Migrate without breaking existing clients
Keep the public alias stable, update the server-side route, then verify one text request, streaming, usage recording, cost, and balance settlement.
Open the complete migration checklist